Stool



FIG. 1 is a front perspective view of a stool showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are for the purpose of illustration portions of the stool that form no part of the claimed design. 

CLAIM The ornamental design for a stool, as shown and described. 